It is a basic unit of life. Larger organisms are composed of cells.
There are two types of cells: $^1$
There are four types of Eukaryotic cells: $^1$
Cell organelles are the parts of the cell that carry out its function.$^0$
It is a sheet-like protective surface that covers the cell. It is selectively permeable.$^0$
They are small globular structures that produce proteins. They are made in the nucleus and are of two types. Free ribosomes roam around the cell producing proteins for the cell. Membrane bound ribosomes are attached to the RER and produce proteins for external(outside of the cell) use.$^0$
Nucleus contains the DNA of the cell.$^0$